Classification
170 - Ethics
363 - Other social problems & services
900 - History & geography
333 - Economics of land & energy
8
700 - The arts; fine & decorative arts
7
140 - Specific philosophical schools
5
320 - Political science
5
620 - Engineering & allied operations
5
100 - Philosophy & psychology
4
551 - Geology, hydrology & meteorology
4
600 - Technology
4
610 - Medicine & health
4
000 - Computer science, information & general works
3
330 - Economics
3
370 - Education
3
380 - Commerce, communications & transportation
3
720 - Architecture
3
800 - Literature & rhetoric
3
300 - Social sciences
2
340 - Law
2
576 - Genetics & evolution
2
580 - Plants (Botany)
2
581 - Specific topics in natural history
2
630 - Agriculture & related technologies
2
200 - Religion
1
361 - Social problems & social welfare in general
1
400 - Language
1
780 - Music
1